TM 9-2320-209-3-1 d. Replacement of Primary Fuel Filter Assembly. FRAME 1 1. Place primary fuel filter assembly (1) against underside of bracket (2) and aline four holes. 2. Using 9/16-inch wrench, screw in and tighten four screws with lockwashers (3) GO TO FRAME 2 TA 047513 4-58